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                2555加强版之wxh loves substring                </h1>
                <p>时间限制：20s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：512MB</p>			</div>
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                                <h3>题目描述</h3><p><div>wxh太强了，他觉得你们太菜了，所以懒得写背景了，给你一个字符串init，要求你支持三个操作</div>
<div>(1):在当前字符串的后面插入若干个字符</div>
<div>(2):在当前字符串的后面删除若干个字符</div>
<div>(3):询问字符串s在当前字符串中出现了几次？(作为连续子串)</div>
<div>你必须在线支持这些操作。</div>
<div><img src="../file/4768_0.png" width="730" height="336" alt="" /></div>
<p></p></p><hr/><h3>输入格式</h3><p><div>第一行一个数Q表示操作个数</div>
<div>第二行一个字符串表示初始字符串init</div>
<div>接下来Q行，每行2个字符串Type,Str&nbsp;</div>
<div>Type是ADD的话表示在后面插入。</div>
<div>Type是DEL的话表示在后面删除。</div>
<div>Type是QUERY的话表示询问某字符串在当前字符串中出现了几次。</div>
<div>为了体现在线操作，你需要维护一个变量mask，初始值为0</div>
<div>读入串Str之后，使用这个过程将之解码成真正询问的串TrueStr。</div>
<div>询问的时候，对TrueStr询问后输出一行答案Result</div>
<div>然后mask = mask xor Result &nbsp;</div>
<div>插入的时候，将TrueStr插到当前字符串后面即可。</div>
<div>HINT:ADD和QUERY操作的字符串都需要解压</div>
<div>字符集大写字母</div>
<div>数据字符串变化长度以及初始长度和 &lt;= 600000，询问次数 &lt;= 10000,询问总长度 &lt;= 3000000</div>
<p></p></p><hr/><h3>输出格式</h3><p><div></div>
<p></p></p><hr/><h3>样例输入</h3><pre>3
A
QUERY B
ADD BBABBBBAAB
DEL 1</pre><hr/><h3>样例输出</h3><pre>0</pre><hr/><h3>提示</h3><p><p>&nbsp;应出题人要求放出数据如下：http://www.lydsy.com/JudgeOnline/upload/wxh.zip</p>
<p></p></p><hr/><h3>题目来源</h3><p>By nzhtl1477</p>
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